Merge bitcoin/bitcoin#33896: clang-format: Set InsertNewlineAtEOF: true

fa1bf68 clang-format: Set InsertNewlineAtEOF: true (MarcoFalke)

Pull request description:

  Now that the minimum supported clang version is 17, the `InsertNewlineAtEOF` setting can be set to `true` in the clang-format file. (https://releases.llvm.org/16.0.0/tools/clang/docs/ClangFormatStyleOptions.html#insertnewlineateof)

  This is in line with the already existing newline linter. Can be tested via:

  ```
  truncate --size=-1 src/init.cpp
  git diff

  # Should fail:
  cargo run --manifest-path ./test/lint/test_runner/Cargo.toml -- --lint=trailing_newline

  # Restore newline:
  git diff -U0 | ./contrib/devtools/clang-format-diff.py -p1 -i -v
  ```

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Tree-SHA512: 6443f0f9e2710fb31c85e4ece5deb9fa25bf22ef2d5cadad2d54a239194860c3a785ffa5dd97be942e42139336575425499f085aa2e3f29003e529fdc20fce20

Author: achow101

src/.clang-format

@@ -123,7 +123,7 @@ IndentRequiresClause: true
 IndentWidth:     4
 IndentWrappedFunctionNames: false
 InsertBraces:    false
-InsertNewlineAtEOF: false
+InsertNewlineAtEOF: true
 InsertTrailingCommas: None
 IntegerLiteralSeparator:
   Binary:          0